Die-casting machine



v Aug. 13, 1929. w.\o. w|;.| ET AL DIE CASTING MACHINE Filed June 29. 1927 3 Sheets-Sheet l IIIN.. l

@w www 7825715 ZZ ,sam

Aug- 13, 1929. w. o. WILL Er AL 1,724,331

DIE CASTING MACHINE Filed June 29, 1927 v 3 Sheets-Sheet 2 A118-, 13, 1929. w. o. WILL Er AL .1,724,331

DIE CASTING MACHINE Filed June 29. 1927 3 Sheets-Sheet 3L ff z V j rj lz/0 6Z/ l H M J'* ZU a /x Patented Aug. 13, 1929.

UNITED STATES PATENT OFFICE.

WALTER O. WILL AND ERIC CARLSON, OF CHICAGO, ILLINOIS, ASSIGNORS T STEWART DIE CASTING CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELA.-

WARE.

Application med .Tune 29,

The purpose ot this invention is to provide an improved construction in a poweroperated die casting machine having all the main operating movements produced by means of devices operated, by hydraulic pressure, and cont-rolled as to their t-ime relations by valve devices controlling the admission ot the hydraulic pressure to them respectively in predetermined order and at predetermined intervals. It consists in the elements and features of construction shown and'described as indicated in the claims.

In the drawings zf Figure 1 is a diagrammatic view showing i5 the main clement of the structure in side elevation and associated elements with their connections to the main structure diagrammatically indicated.

Figure 2 is a side elevation and Figure 3 a front elevation showing a modification of the means of communicating reciprocating motion to the movable die carrier from the hydraulic pressure member provided for operating it.

Figures 4, 5i and 6 are sections of the valve devices and the cams controlling` the How of the pressure Huid to the hydraulicpressure-operating means for operating respectively the movable die carrier, the metal ,qu pot for registering with. the die, and the compressed air controlling means for admitting fluid pressure to the metal pot for injecting the metal into the die; l

Figure? is a section at the line 7--7 on Figure 1.

v Figure 8 is a section at the line 8-8 on Figure 7.

Figure 9 is a 'detail elevation on an enlarged scaleshowing the parts at the lower left hand corner of Figure 1 in section as to the arm, X, and valve, W.

The structure shown in the drawings comprises a horizontally -exte'nded base fraine structure, A, 0n which there is mounted an upright frame structure indicated in totality by the reference letter, B, and comprising four upright standards, B1, upon which there is mounted slidingly a reciprocable die carrier, D, which co-operates with the fixed die carrier, C, on the base frame, A. M and N are respectively upper and lower die members mounted respectively on the reciprocating die carrier, D, and a DIEcAsTTNG MACHINE.,

1927. Serial No. 202,259.

The differently diametered portions of thev piston, viz, the upper larger diametered part, E, which may be called the head, and."

the lesser diametered part below the head which may be called the stem, both of the piston and 'of the upper die carrier, D, are fitted respectively in the cavity of the cylinder, F, and' in the central aperture, B2, of the upper horizontal plate element, B, of the frame, B. Said plate, B2, is constructed for securement to the four corner uprights, B1, as seen in Figures 7 and 8, the construction consisting of said plate element, B, which is octagonal in form, and split collars, or clamps comprising each two parts, b1 and bn, dimensioned for being clamped tightly onto the corner uprights, B, by bolts, Zim, said clamps being bolted fast to the alternate longer sides of said octagonal plate as may be understood from Figure 7. The clamps, b10 and bn, have their facing semieircular recesses dimensioned to permit the device to be clamped tightly onto the corner uprights, B, by the bolts, b1?, which serve also for securing both members of the clamp 'to the plate, B2. Said corner clamps of the plate, B2, being made fast in proper posil tion on the corner posts by setting the clamping bolts tightly, serve as denite stops above and onto which the bottom marginal flange, F1, of the cylinder, F, is clamped rigidly as above mentioned so as to make a fluid-tight joint by tightening the nuts, b2, applied upon the upper threaded ends of said corner uprights, B, the bolt holes being positioned properly for positioning the cylinder with its cylindrical cavity coaxial with the aperture in the plate, B2, in which the lesser diametered part,` E, vof the piston is fitted when the parts are com letely assembled and'seeured together by t e tightening of the nuts, b2, as described.

The upper die carrier, D, is made for being mounted slidably on the corner osts, B, bythe same expedient as that emp oyed for securing the plate, B2, to the post, namely, by four two-part slide members each comprising parts, d10 and du, similar to the parts, b1 and b, except that they are d1- mensioned as to their facing semi-circular recesses for sliding on the uprights instead of for being clamped tightly thereon.

From the foregoing description of the parts it may be understood that `for assembling the structure the upper die carrier, D, without the corner slide guide members, d10 and du, may be introduced between the corner posts and lodged in proper horizontal position above the lower fixed die carrier, and the clamps, d10 and d, having their two parts respectively assembled together on the posts, B, and slid down thereon to posltion for securement to the proper alternate sides of the octagonal die carrier, D, will be secured thereto, thus completing the assembling of said upper die carrier. The piston comprising the stem, E, and the head, E1,

rigidly secured together and having the stem introduced through the central aperture of the plate, B2, said plate and piston may be insiiiuatedbetween the corner uprights, and

the piston head being entered in the lower' end of the cylinder, F, the piston may be brought to proper vertical position, and the plate, B2, may be rotated to proper horizontal position with its alternate sides positioned properly toward vthe four posts respectively, and the clamps, b1", b, being then assembled about the osts respectively, may be brought into registration` with the proper sides of the octagonal plate and secured thereto by bolts, leaving the clamp members loose enough to permit sliding the plate with said clamps up along the posts to proper posit-ion against the lower flange, F1, of the cylinder, F, at which position the clamp bolts may be tightened sufficiently to hold the plate securely while the nuts, b2,

-`are tightened to make the junction between the said iange` and said plate, B2, fluidtlght. The piston may be then made rigid with the die carrier, D, by bolts e1 through the piston flange, e, taking into the die carrier, D.

It will be observed that this construction l affords opportunity for supplying hydraulic pressure to the cylinder, F, above-the piston head, E1, for operating upon the area of said head and also for introducing hydraulic pressure to the annular space below the head, E1, whose width is defined by the difference 1n radius of the main body, E, of, the piston and olf the piston head, E1, whereby the hydraulic pressure thus introduced below the head, E1, operates upon the annular marginal area of the under side of the head, E, around the piston body, E. t

Means for developing hydrauhc pressure consists of a pump shown conventionally at H, operated by an electric motor shown conventionally at J said pump being connected with a reservoir, G, of suitable liquid for the purpose of hydraulic pressure by the intake pipe, G1, shown extending down for intake near to the bottom of the reservoir, G, the discharge from the pump being by the pipe, G2, leading to the lower end of an upright cylinder, K, in which there is fitted a plunger piston, L, having at its upper end an enlarged head, L1, fitted and reciprocating in a larger cylinder, K1, at the upper end of cylinder, K. This cylinder, K1, is a compressed air chamber in communication by pipe, c, with a reservoir, K2 for cornpressed air, which is maintained charged to desired pressure by connection with suitable priming means not shown. From the lower end of the cylinder, K, a pipe, G, leads for communicating hydraulic pressure to the upper end of the cylinder,F, by Way, however, of the chamber, T, of a controlling valve to which the pipe, G3, directly leads, and from which the pipe, S leads to the upper end of the cylinder, F, as indicated at the port, s1. From the valve chamber, T, a second pipe, s, leads to the cylinder, F, to which is connected at the lower end for admitting pressure to, the annular space below the piston head, E1, around the main body of the piston, E, as seen at the port, s2. The construction of the 4 controlling valve in the valve device, T, will be hereinafter described, it being understood that the purpose is to alternate the admission of the hydraulic pressure liquid o the upper and lower ends of the cylinder, F, that is, above and below the piston head, E, therein for reciprocating the die carrier, D.

Upon the horizontally extended main frame or bed, A, there is supported a source of molten metal which comprises a metal pot, U, suspended within a heating chamber, U1, shown conventionally, and in outline only, the-details-of the construction constituting no part of the present invention. For ejecting the molten metal from the metal pot and carrying it to the entrance to the die for injection thereinto, there is provided a metal\ carrier and injector, O, in goose-neck form, having connection at its upper end, 21, outwardly from the dies in the upright frame structure by the pipe, 20, with a source of pneumatic pressure for e'jecting the metal from said carrier as hereinafter described, and having at the other end a discharge and injection nozzle, 22, adapted to be moved into registration with and to register with the die inlet indicated at 23 at the meeting plane of the two parts,

till

M and N. The metal carrier and injector, 0, is carried by a bracket terminal, 25, mounted at the inner end,-that is, the end toward the dies,'-of the stem, 26, of a piston plunger, fv, which co-operates with a fixed cylinder, V, pivotally mounted on the upstanding` bracket arm, A1, ,of the base frame, A. It may be understood, as will be hereinafter described, that the retraction of the stem, 26, by the piston, o, when driven to the remote end of the cylinder, V, withdraws the metal carrier and injector, O, from its position of registration with the die at which it is 'shown in dotted line in Figure l; and it may be understood that the pivotal mounting of the cylinder, V, on the rigid bracket, A1, and the longitudinal sliding of the piston, o, with its stem, 26, in the cylinder, V, permits the carrier and injector when thus retracted from the die to be lowered into the metal pot; and it may be understood that in the'manner and by the means hereinafter described or in any other obvious or preferred manner, it is adapted when thus lowered into the molten metal to receive a suitable quantity of the metal to be afterward injected' into the die. The control of such lowering and lifting movement of the metal carrier and injector is effected by means of a cable, 27, comprising a turn buckle, 27", for adjusting its length, attached to the bracket, 25, at the inner and upper end of the latter, and extending over the pulley, 28, mountedon the upper horizontal member, B2, of the upright frame, said cable extending thence down to connection shown at 29 with the upper reciproeating die carrier, D. From this description it will be understood that the upward movement of the die carrier, l), lowers the inner end of the bracket, 25, and that if the metal carrier and injector, O, has previously been withdrawn from the position of registration with the die so as to suitably overhang the melting pot, it will be lowered into the metal by the upward movement of the die carrier, D; and, correspondingly, that the descending die-closing movement of the die carrier,`D, willlift the metal carrier and injector, O, from the metal with which'l it vvlll'l have been filled while depressed, and positlon its discharge end at proper level for registering with the die inlet when .the piston, lv, is forced to the inner end of the cylinder, V, for thrusting the bracket, 25, toward the dies. For thus operating the hytiraulic pressure device, comprising the cylinder, V, and piston, fv, connection is made by the pipe, G3, with the cylinder, V, by way of a controlling valve in the valve device, T1, from which the pipe, S1, leads to the outer end of the cylinder, V, and from which the pipe, S1,'leads to the inner end of the cylinder, V

For ejectmg. metal from the metal carrier and injector when the die has been operated in the manner described, there is provided a connection by the pipe, 20, leading from a source of compressed air as the reservoir, K2, to the upper outer end, 21, of the metal carrier and injector; and in said pipe, 20, there is interposed a valve device, "W, which is operated in proper time relation with the closing and opening of the die by a hydraulic pressure device consisting of the cylinder, X, mounted near the lower end of the bracket, A1, of the main base frame, and having a piston, fc, reciprocating therein with its stem, m1, connected. to the valve member, w, in the valve device, lV, which is operated for admitting compressed air to the injector, O, and for venting the same to the atmosphere as will be understood without further description from the construction of said valve device, lV, shown in Figure 9. Pipes S2 and S2", are connected respectively to the lower and upper ends ot' the cylinder', X, said pipes 'reaching from thetiming valve chamber' T2, interposed in the connection afforded by a branch of the pipe, G3, with a source of hydraulic pressure above described, said timing valve being constructed for timing the action of the valve, lV, as above indicated.

The connections for hydraulic pressure to the opposite ends of hydraulic pressure cylinder, V, are controlled by the valve in the valve device, T1, as hereinafter described for timing said opposite end admissions of hydraulic pressure ,with respect to the movement of the metal carrier and injector, O, so that the shift of hydraulic pressure to the upper end ofthe cylinder, V` shall occur while the die is opening and lowering the carrier and injector, O, into depressed position with the injector nozzle submerged in the metal; so that the venting of the pressure in the metal carrier andinjector to permit it to be filled by gravity by the molten metal entering through its nozzle while it is submerged in the metal. And the cam which operates the timing valve which controls the operation of the pressure device, X, for operating the valve, W, is formed for causing the venting of the air pressure in .the carrier and injector, O, before the latter is withdrawn from thedie and for admitting the air pressure to said carirer and injector only after it4 has been moved .into registration with the die.

In Figures 2 and 3 there-is shown a modiication of the means for communicating reciprocating movement to the upper die carrier from the piston of the hydraulic pressure element which is provided for operating it. This modified construction is in general of a character permitting employment of degree crank and link movement for transmitting the reciprocating movement of the hydraulic pressure element to the re- Llil ciprocable die carrier in a manner obviating' the embarrassment normally pertaining to such movement in respect to crank wrist passing dead'center7 while nevertheless obtaining the advantage of the climax of force exerted at the alignment of the crank with `52, with the reciprocable die carrier, I), each having also a third crank arm, 60, projecting in diametrically opposite direction from the crank arms, 50, 50, and connected by a link, 61, with the cross head, e1, at the upper end of the stem, e, lof the piston head, E1. The crank arms and links are relatively dimensioned so that when the piston head, E1, is at the upper end of the cylinder, F, the crank arms, 60, 60, project upwardly in planes parallel to the piston stem, e, and the links, 61, 61, extend in line with each other horizontally,-transversely to the rock shafts, ,50, 50,- and the crank arms, 51, 51, at this position extend in the direction for directly downwardly holding the links, 52, 52, in line with them respectively, so that the maximum force derivable from the hydraulic pressure for closing the die members together is obtained in the last increment of the rotative movement of the rock shaft-s derived from the reciprocation of the piston. And when the piston, E1, is at the opposite limit of its stroke in the cylinder, F, the crank arms, 60, project in line with ea h other at right angles to the path of reciprocation of the piston, E1, in its cylinder, and the links, 52, 52, extend parallel to each other and parallel to said stem while crank arms, 51, 51, project outwardly, cause the links, 52, 52,

' to extend from their connection with the reciprocating die carrier, D, so slightly out of line with the direction of movement of the die carrier as not to cause any embarrassment in respect to the reciprocating movementv communicated for opening the die.

In Figures 4, 5 and 6, there are shown the valve devices, T, T1 and T2, which control the fiow of the operating fluid to 'the several hydraulic pressure devices. These valve devices are all alike, differing only in respect to the timing of their action by the cams which respectively control them, which are shown in said Figures 4, 5 and 6 respectively. From the foreofoing description of the general mode ot? operation of the machine it will be understood that the action of all of the hydraulic pressure devices is tle same in respect to the succession of the several movements, being that the pressure is admitted by the operation of the controllingr valve at one end of the cylinder and kept in communication While the resulting movement of the piston is performed and as long as the part actuated by said movement should remain held in the position to which it is carried by said movement; next, the valve moves in its casing to a position for cutting off the pressure from the end of the cylinder to which it was admitted by the first movement, and permitting vent from that side ,of the piston back to the liquid reservoir, G, while pressure is admitted to the opposite end of the cylinder for driving the piston in the opposite direction and forcing the liquid from the end of the cylinder to which the liquid was first admitted back to the reservoir as mentioned. In cach instance, the actuated part is held for a limited portion of the complete cycle of the action of the machine at each of the positions described, and in each case after the return movement the valves are retracted by their respective cams to a position at which there is no communication of the hydraulic pressure past the valve to the hydraulic pressure device which it controls, either to one end or the other, this being referred to as the normal or rest position of the parts.

Referring to any one ot the valve structures shown in Figures 4, 5 and 6, 80 is the valve chamber,'being a slide-Way for the valve member, 90, whose path of reciprocation in the valve body is from the dotted line, 82, to the dotted line, 83, the valve body having pressure inlet port to said chamber, 84, which registers with the groove, 91, extending the whole length of the valve, 90, and outlet ports at the opposite side at 85, 86 and 87, the port, 85, leading to one end of the cylinder to be served, the port, 86, leading to the other end of the cylinder, and the intermediate port, 87, leading back to the liquid reservoir, G. The valve member, 90, has an extended passage, 93, of proper length, so that the valve at one extreme position spans the intervals bet/Ween the ports, 85, and 87, and at the other position s ans the intervals between the ports, 86 an 87, in each case eifecting flow communication back to the reservoir from one end of. the cylinder controlled while admitting pressure through the other port to the opposite end of the cylinder. f'

The cams, R, R1, R2; which control the valve devices, T', T1 and T2, respectively are mounted on and rotated by a shaft in common, a, which is driven by regulatable motor of any convenient type, as the electric motor indicated at J1, rotation being communicated from the motor shaft. to the shaft, 1'1,

.by intermeshing Worm and Worm gear, R"

and Rw, respectively, on the motor shaft, and the shaft, r1. Preferably the motor, J 1, for operating valve devices, T1, T2, through the connections described, is independent of any other motor employed in the apparatus, as for example, the motor, J, which operates ings to be face cams having their cam tracks,

r, engaged by stud-and-roll abutments, r1, on the stems, 95, of the respective valves, 90.

In Figures 4, 5 and 6 the cams and valves are shown at the proper positions corresponding to the positions at Which the parts of the controlled mechanism are seen in Figure 1, that is, with the die members closed ltogether, and a metal carrier registered with the die inlet for injecting the molten metal into the die, ready for the air pressure to be admitted to the metal carrier to thus inject the metal. Accordingly, the cam stud roll, r1, of the cam, R, stands at an intermediate point in the concentric part of the cam groove of said cam, R, While the valve member in the valve device, T, is held at position for admitting the hydraulic pressure to the pipe, S, leading to the upper end of cylinder, F; and cam, Rlkis seen .at the position as having just openedithe valve member in the valve device, T1,-admitting hydraulic pressure to the pipe, S1, leading to the outer end of the cylinder, V, in Which the piston is shown as having' moved to position for swinging the metal carrier, O, into registration with the die; and cam, R2, is shown at position for holding the valve member in the valve device, T2, at closed position ready to be opened upon the further rotation of the cam, R2, wherein the cam stud and roll, r1, is just entering the inwardly trending course of the cam groove which Will draw'the valve, 90, down to open position for admitting pressure to the pipe, S2, for driving up the piston in the cylinder, W, to force air into the metal carrier to inject metal into the mold. j n The several cams will be understood upon inspection as having their cam grooves laid out for giving to the several parts their proper movement in proper time relation to each other for causing the several actuated parts .to function in accordance with the foregoing description of the mechanism.

Thel structure above described is designed and 'adapted to` be supplemented by coreoperating connections to the upper and lo W- er die carriers as indicated by the representation of core stems, m and n, shown in Figure l, protruding from said die carriers respectively. Such core-operating connections may be operated by fluid pressure means similar to the hydraulic means shown for the movements described; and 'such uid pressure means are designed to be controlled in predetermined time relation to the other operating movements of the construction described,'by valve devices like those indicated at T, T1 and T2, camcontrolled and connected in the same manner as said valve devices; and the diagrammatic showing in Figure 1 of said valve devices and cam-operating connections is shown broken between the valves, T1 and T2 and cams, R1 and R2, to indicate the indefinite extent of that portion of the structure for including any additional number of cams and'valves for controlling lany additional number of cams and valves for controlling any corresponding number of additionaloperating parts such as the coreoperating means indicated at m, n.

From the structure of the controlling valves, T, TIV and T2, shown in Figures 4, 5 and 6, it will be readily understood that at what may be called the normal or initial position such, for example, as that shown in Figure 6,'all access of hydraulic pressure to the operating ram is out oli, and that at a subsequent position such, \for example, as seen in Figures 5 and 6, the pressure is admitted from the pipe, G3, by Way of the valve passages, 91 and 85, and the pipes leading from passage, 85 to one end of the respective cylinders, While at the same time the liquid returns from the opposite ends of the respective cylinders by Way of pipes, s, Slo and S2", and the valve passages, 86, in the respective valves, andthe pipes, G4, leading from the respective valve to the reser- Voir, G; and that at a 'position of the valves which may be termed the opposite of that last mentioned, communication is reversed, the hydraulic pressure obtaining access from the pipe, G", by Way of the passages, 91 and 86, to the ends of the ram cylinders from` which the return flow occurred in the previous position, the return flow occurring now from the other ends of the ram cylinders by Way of the pipes, S1 and S2, to the valves, and by. the passages, 85 and 87, therein to and through the pipe, G3, to the reservoir, G.

` 1. In a die casting machine in combination with opposed die carriers and a frame in which they are mounted for reciprocation of one carrier toward and from the other, acylinder having connection for hydraulic pressure, and a piston rcciprocably mounted therein and connected for actuating the reciprocable die carrier; and liquid ilovv con,- nections from a source of hydraulic pressure' to the cylinder at opposite sides of the pistonl therein; a regulable motor and valve mechanism operated thereby for controlling in predetermined. time relation the admission of tion with opposed die carriers, a frame structure in which they are mounted for reciprocation of one of said carriers toward and from the other;l a dipper-and-injector mounted for dipping into a source of molten metal for becoming charged With the molten metal; operating means for so dipping and lifting it and carrying it intoregistration of-its discharge terminal with the inlet to a die carried by the die carriers; a cylinder and piston therein having connection from the opposite sides of the piston for admission of hydraulic pressure, and pipe connections from a source of hydraulic pressure to the cylinder at opposite sides of the piston; connections from the piston for actuating the dipper and injector operating means; a regulable motor and valve means operated thereby for controlling the admission of hydraulic pressure alternately to the opposite sides of the piston in said cylinder in predetermined time relation suitable for )the dipping and registering movement of the dipper and injector.

3. In combination with the construction defined in claim l, and means for dipping and carrying molten metal having a discharge terminal adapted'to register With the inlet of a die carried by'the die carriers; operating means moving said metal-carrying means for dipping to receive and registering to discharge the molten metal;` hydraulic Apressure actuated means for actuating said metal-carrier-operating means; a regulable motor arid valve mechanism operated thereby-for admitting hydraulic pressure to said pressure-actuated means Vfor operating said metal dipper and carrier for registering with and withdrawal from the die in predetermined time relation to the die opening and closing movement of the hydraulic pressure operated by the carriers.

'4. In combination with a frame structure adapted to support a source of molten metal, opposed die carriers mounted therein for reciprocation of one of them toward the other, a. container for molten metal mounted on the frame structure for movement into and l out of the molten* metal source 'for becoming charged with the molten metal to be injected into a die carried by the die carriers, said container having a discharge nozzle for reglstermg with an inlet to such die for injecting the metal thereinto; mechanical .connections for so moving the container;

hydraulic-pressure-actuated means for recip- I'ocating the reciprocable die carrier; hy-

shalt-in-common of said devices, and a regulable motor for rotating said shaft, whereby the operations of said different hydraulic pressure devices are caused to occur i-n predetermined time relation to each other.

5. In the construction deined in claim 4, a circulatory pipe system in which the container is connected, said circulatory system containing also a compressed air cylinder and piston movable therein against and also in response to the 'resilient /reaction of the compressed air, hydraulic-pressure-actuated devices, and intermediate in said hydraulicpressure-actuated devices respectively, valve devices controlling communication between the pressure cylinder and said pressure-actuated devices for controlling the admission to and return from said devices oi the circulatory liquid.

6. In an ap'xvaratus for the purpose indicated, a circulatory system comprising in the circuit (a) a liquid container, (b) a pump for circulating the liquid, a hydraulic pressure cylinder and piston and a compressed air chamber and piston therein connected for resilient reaction of the compressed air on the piston of the hydraulic pressure cylinder, (d) valve devices` for the hydrostatic pressure means respectively, and (e) return flow connections from said hydrostatic pressure means to the liquid container.

7. In a die casting machine in combination with opposed die carriers and a frame in which they aie mounted for reciprocation ol one of them, a molten metal container and a molten metal carrier mounted for carrying molten metal from the container to a die on the die carriers; operating means for giving said molten metal carrier movement for carrying the molten metal to the die; coinpressed air means connected with the molten metall carrier for injecting the metal from the carrier into the die; and valve means for controlling the compressed air means; devices adapted to be actuated by hydrostatic pressure andy connected for actuating respectively the reciprocating die carrier, the

molten metal carrier operating means and the compressed-air-controlling means; a pump for developing the hydrostatic pressure; pipe connections therefrom to the several hydrostatic-pressure-actuated devices respectively, and pressure regulating valves in said pipe connections respectively, for controlling the pressure communication to the opposite sides of the moving members in said devices respectively, a shaft-in-eommon for actuating said valve devices, and a regulable motor for rotating said shaft, said valve devices being adjusted with respect to said shaft-in-common for operating the several hydrostatic pressure-operated devices in predetermined time relation to each other.

S. In a die casting machine in combination With a frame structure, die-carrying means therein and means for operating them for opening and closing a die; molten metal injecting devices and connections for operating them tovcarry molten metal to the die; pneumatic means for injecting metal into the die from the metal carrying means; devices adapted to be actuated by hydrostatic pressure for operating the die carriers, the metal carrying means and the metal injecting means; a circulatory system in which said hydrostatic-pressure-actuated devices are connected; a container for the hydrostaticpressure-actuated of liquid; a pump for circulating said liquid to the several devices; the circulatory means comprising a cylinder and piston therein to which the hydrostatic pressure liquid is supplied by the pump and from which said liquid passes to the several hydrostatic pressure devices; a compressed air cylinder and piston therein connected ier its own in-stroke With the piston of the lastl mentioned hydrostatic pressure device, and valve means interposed in the connections to the several hydrostatic-pressure-actuated ldcvices for controlling the admission o'f the hydrostatic-pressure-actuated liquid to said` devices respectively; a shaft-in-coininon by which said valves are operated in predetermined time relation to each other, and a regulable motor fordriving said shaft.

9. In a die casting machine, a frame struc! ture and die carrying means mounted therein for reciprocation oit' one of them toward and from the other; a hydrostatic cylinder and piston therein connected for such reciproca,- tion; a molten metal container and a metal cairier mounted and connected for carrying molten metal from the container for injection into the die on the die carrier; pneumatic pressure means for injecting the molten metalfrom themetal carrier into the die; valve means controlling said pneumatic pressure means; a hydrostatic cylinder and piston therein connected for operating the metal carrier; a hydrostatic lcylinder and piston therein connected for operating the pneumatic pressure-controlling means; a pump for producing hydrostatic pressure and conduits for the liquid pumped thereby to the opposite sides of ,the piston in the hydrostatic cylinders respectively, and pressure regulating valves in said conduitsrcspectively for controlling the admission of the hydrostatic pressure liquid to the opposite sides of the pistons in the respective hydrostatic cylinders; operating; means-incommon for all said valve devices, said valve devices being adjusted With respect to said operating means-in-common for controlling all the hydrostatic devices to effect the several operations which they respectively perform in predetermined `time relation to each other. i

the pump and connected with the piston of the compressed air chamber ,for actuating the latter in air compressing direction by the pressure-producing movement of said cylin- -der piston, said cylinder' being antecedent in each or' said circuits to the hydrostatic-pressure-operated device thereof.

1l. A die casting machine comprising in combination with opposed die carriers and a frame in which they are mounted for reciprocation of one of them toward and from the other, a container for molten metal and a metal carrier mounted for carrying molten vmetal from the container to a die in the die carriers; operating means for giving said metal carrier fn-iovement for carrying the molten metal; compressed air means connected with the metal carrier for injecting the metal from the metal carrier into the die; and valve means controlling said compressed air moans; vhydrostatic pressure means for actuating respectively the reciprocated die carrier, the metal carrier operating means and the compressed-air-controlling means; a pump for developing the hydrostatic pressure7 and pipe connections therefrom to the hydrostatic pressure means.

12. In a construction for the purpose specified in combination with a cylinder and piston adapted for fluid pressure connection to both sides of the piston for producing power strokes in both directions, a Work member mounted for reciprocat-ion for performing its Work, a rock shaft journaled transversely vof the direction of reciprocation of the Work member and the piston, said rock' shaft having crank arms projecting in opposite directions and links connectin the crank arms respectively tothe operating piston and to the actuatedwork member, the link connection to the operating piston being equal in length tothe 'piston stroke, whereby said stroke rocks the 'rock shaft through 90 degrees.

13. In a construction for the purpose indicated in combination with a cylinder and piston adapted for fluid pressure connection to both sides of the piston for producing power stroke of the piston in both directions, a Work member mounted for reciprocation for performing its Work; a pair of rock shafts journaled transversely of the direction of reciprocation of the piston and work member at opposite sides of the path of reciprocation of the piston and having crank arms and links extending from them respectively for connection. to the piston, the links being dimensioned for extending in alignment with each other when the crank arms are parallel at one limit of the stroke of the piston whereby at that limit the stroke of the piston exerts maximum force for actuating the rock shafts, said rock shafts having also crank arms extending in different direction from the first mentioned crank arms and links connecting said crank arms respectively with the reciprocated work member.

14. In a construction for the purpose specified in combination with a cylinder and piston adapted for fluid pressure connection to both sides of the piston for producingr power stroke of the piston in both directions, a Work member mounted for reciprocation' for performing its work, a pair of rock shafts journaled parallel to each other and transversely of the piston stroke at opposite sides of. the piston stem, links connecting said crank arms respectively with the piston stem dimensioned for extending in alignment with each other when the crank arms are parallel to the piston stem at one limit of the piston stroke and for extending parallel to the piston stem and to each other at the opposite limit of the piston stroke, said rock shafts having other crank arms and link connections from them respectively to the reciprocated l work member, said last mentioned crank arms and the respective link connections being dimensioned for extending in alignment with each other at the position of the rock shafts at which the first mentioned crank arms thereof are parallel to each other and the links therefrom are in alignment.

15. In a construction of the character indicated in combination with a frame structure comprising a system of rigid parallel rods constituting part thereof, a plate inember to be carried by said rods constructed for mounting and dismounting from the rods, being for that purpose dimensioned for being entered between two of said rods into the space between and defined by the system of rods, and two-part bearing members adapted to be applied to the rods and closed together thereon, the edge of the plate being formed adjacent to the frame rods respectively for seating said bearing members when the latter are closed together on the respective rods, and means for securing the parts of the bearing members together on the rods and securing them to the plate.

16. In the construction defined in claim 14, the bearing members being dimensioned for sliding fit on the rods when they are closed together and secured to the plate.

In testimony whereof, We have hereunto set our hands at Chicago, Illinois, this 23 day of June, 1927.

WALTER O. WILL ERIC CARLSON. 

